Dutch researchers report a 30 percent higher risk for depression among parents whose infant cried excessively. (The study defined excessively as crying for more than three hours per day on more than three days per week.) Also, a dad with symptoms of depression was twice as likely to have an infant who cried excessively compared to a dad who was not depressed.

The researchers emphasized that this study shows how depression can lead to an infant's colicky crying, so a father's and mother's well-being should be taken into account. We've heard of women having postpartum depression, but dads? Looks like it's more common than you would think. Fatherhood is hard—admit it! Check out our dad's survival guide to help you out.